I went down to Leatherhead today. For once I felt it was an ept and productive day, even if I did oversleep this morning (I still caught my train!). The 8:02 to LLS is an ept train for getting to LHDHPS by 11am, and I was able to sleep all the way between about Finsbunny Park and Victoria on the tube.
I'm always amused that off the HPC canteen has a room off it marked only "IRC".
I suspect more trips to LHD will be in the offing, possibly including a multiple day one.